/**
 * Find an asset in a map of asset names to their files. If the searched asset name has a pipe
 * symbol in it, the part after that is seen as the extension of the file we look for.
 *
 * @param {Object} assetFileNames
 * @param {string} assetName
 * @return {string}
 */
function findAsset (assetFileNames, assetName) {
    const [assetFileName, assetExtension] = assetName.split('|');
    const assets = assetFileNames[assetFileName];

    const [asset] = assets.filter(function hasExtension (asset) {
        return assetExtension
            ? asset.split('.').pop() === assetExtension
            : asset;
    });

    return asset;
}

module.exports = findAsset;